Wheel head for machine tools



July 1927' J. A. DOANE WHEEL. HEAD FOR MACHINE TOOLS 3 Sheets-Sheet 1 Filed Nov. 2. 1923 I INVENTOR. 9501541 191rma By #W A TTORNE Y.

July 1927 J. A. DOANE WHEEL HEAD FOR MACHINE TOOLS Filed Nov. 2. 1925 3 Sheets-Sheet 2 I N VEN TOR.

A TTORNEY.

Jqly 5, 1927. J. A DOANE WHEEL HEAD FOR moms TOOLS Filed Nov. 2. 1925 s Sheets-Sheet 3 & M w m@ M WW 7 1 2 w 0 0 9 J o 3 2 1 1 HHHHHHm$W H I IHW MH I IMMMQM Em m 1 Hi l|\|| ll \\|l\ V1 .J K B d I I WW I, w mm 1 1 M N W l l I! l 1!; 1 :f I IIH! l 5 I'M A I 1 A ll iififllkwll I J65. m 1 Q o m 2 5 w w 7 5 7 w 2 I ATTORNEY.

Patented July 5, 1927.

STATES A'I'Ehl'i' FFEQEL.

JOHN A. DOANE, OF HARTFORD, CONNECTICUT, ASSIGHQR TO PRATT & WHITNEY COM- PAINY, OF NEW YORK, N. Y., A CURPORATIGN CiF NE? JERSEY.

WHEEL HEAD FOR MACHINE TOOLS.

Application filed November 2, 1923. Serial No. 672,397.

This invention relates to machine tools surface grinding machine, parts being shown and. in particular to surface grinding and in section to more completely disclose their milling machines in which a slidably inountconstruction.

ed head is used to support a rotatable cut- Fig. 2 is a plan view of the complete ma- 55 5 ting wheel. chine also having parts shown in section,

A principal object of the present invenand tion is to provide improved means for slid- F ig. 3 is a front elevation of a portion of ably supporting the head carrying the cutthe machine showing the principal parts of ting wheel particularly to increase the the present invention. to I" rigidity of its support. In the above mentioned drawings, I have ()ne feature which enables me to accomshown but one embodiment of the invention plish the above object is that a wheel head which is now deemed preferable but it is to of special form is provided in which two be understood that changes and modificasets of guides are mounted at widely spaced tions may be made within the scope of the 60' positions. The additional or supplements. appended claims without departing from the guides are spaced from those usually prospirit of the invention. vided on wheel heads for machines of this Briefly, my invention in its broadest type but preferably in alignment therewith aspect comprises the following principal and are placed on the opposite side of the parts: first, a base having thereon a work 70 wheel. spporting table; second, a column secured Another feature which is advantageous is rigidly to the said base; third, a wheel head that the wheel head is formed integrally of slidably mounted in suitable ways provided one member, portions of which substanon said column; fourth, a wheel rotatably tially surround and enclose the rear pormounted upon the wheel head; fifth, a pair tions of the wheel, two spaced apart sets of of guides formed upon laterally extending guides being provided in these two portions projections of said wheel head; and sixth, and serving to support the head more rigida depending projection formed on said Wheel ly than in machines now in common use. head also having laterally extending guides,

Another object of the invention is to prothis latter projection and the guides formed SQ vide co-acting means on the column of the thereon being positioned below the rotatable machine which have corresponding aligned wheel. guiding ways suitably spaced apart and Referring more in detail to the figures of adapted to engage the guides on the wheel the drawings, the surface grinding machine h d, shown in the drawings comprises a base 10, 85 With these and other objects in view, my on which is rigidly secured a column 11 as invention consists in the features of conby means of the bolts 12 shown in Figs. 1 struction and operation set forth in the foland 3. Mounted upon a horizontal surface lowing specification and illustrated in the within the base is the work support 18. In accompanying drawings. the particular embodiment illustrated, this 0 In the accompanying drawings, I have work support 18 is rotatable and preferably shown my invention embodied in a surface may be driven from a motor 14 housed grinding machine but it will be understood within the base 10 through driving connecthat the invention can be otherwise emtions 15 including a pinion 16 in engagebodied and that the drawings are not to be ment with a spur gear 17 on the lower surconstrued as defining or limiting the scope face of the work'support. This work supof the invention, the claims appended to this port 13 also may be provided with a pluspecification being relied upon for that pin rality of independent chucks 18, each chuck pose. subtending a small portion only of the pe- In the drawings annexed hereto and formriphery of the work table 13. These indg- 50 ing a part of this specification: pendent chucks 18 which preferably are of Figure 1 is a side elevation of a complete the inagnetic type are adapted to be succesconstruction permitting it -ed upon dle within the head 21.

sively magnetized and electrical connections 19 shown partially in Fig. 1. As these members above described i'orm no direct part of the present invention, it is not thought that a further description of them is required.

Adapted to be adjusted so that it may operate upon work placed upon the work table 13 is an abrasive wheel 20. This wheel 20 is carried in a wheel head 21. of special to be supported so that it may slide rreely but being prevented from distorting its shape due to strains imposed upon it during operation. For this purpose, the head 21 carrying the rotatable wheel 20 is elongated vertically and provided with independent widely spaced guides located on opposite sides ot the wheel 20, that is, above and below the abrasive surface of the wheel. As is usual in machines of this type, the wheel 20 is mountthe lower end of a vertical spin Also the usual vertical guides are provided on the head on opposite sides of the head portion. The pardeanagnetized by I ticular improvement or the wheel carrying head 21 over the prior art is that a supplemental-y portion is formed on the head extending below the wheel 20. This supplementary portion is integral with the main portion of ti e head and connected thereto by a web portion 35 surrounding a large portion of the wheel 20. Guides on each side of both the main and supplemental parts of the head 21 give bearings upon widely spaced areas so that the head 21 is of a more rigid term than those of the prior art and thus can be rigidly supported While permitted to slide freely. Driving means for the wneel 20 and its spindle may be provided within the base 10. As shown in Fig. 1, the motor 36 is provided which is attached to the spindle for the wheel 20 by means ot a connecting shaft 24. This shaft preferably permits sliding movement between itseli and the wheel spindle so that adjustments of the wheel head 21 may be made while rotating means for the wheel are maintained.

Upon iront vertical surfaces of the column 11 are planed ways 25 and 26 which are in alignment with each other. These ways'25 and 26 are widely spaced apart,

one pair 25 being above the portion or the column 11 at which the wheel 20 operates and which corresponds to those usually provided in machines of the present type. The other pair of ways 26 is below the plane of the wheel 20. Clamping strips 27 and 28 are provided to suitably enclose the corresponding guides provided on the wheel head 21.

The wheel head 21 as shown most clearly in Fig. 8 comprises an integral member havin a depending extension substantially enclosing the rear portions of the wheel 20, and, in addition to the housing for the wheel spindle it is provided with a projection 31 extending below the wheel 20. This projection 31 is provided with guides 29 in alignment with guides 30 provided in the upper portions the wheel head 21 formed as above, it is guided not only by the guides 30 above the wheel 20 operating on the ways 25 as is now the usual custom but is also guided by the supplemental pair of guides 29 directly in alignment with the first named guides and on the opposite side of the wheel 20.

By reason of this construction, the supporting means tor the wheel head 21 are not such that the wheel head 21 is overhung from one set of ways at the point where the maximum pressure of the work against the wheel is produced, but is at all times rigidly supported on opposite sides. The wheel head 21 is therefore freed from the tendency to distort or twist out of proper position due tothis pressure.

What It claim is:

1. A machine tool comprising in combination, a frame, a work support, a rotatable cutting wheel, a wheel head for slidably supporting and guiding said wheel, said head con'iprising upper and lower portions each having guides cooperating with corresponding guide ways provided on the machine tool frame whereby the wheel head is rigidly but slidably supported on said frame at widely spaced portions.

2. A machine tool comprising in combination, a frame, a work support and a cutting wheel, a wheel head for slidably supporting and guiding said wheehsaid head comprising a housing substantially enclosing a portion of the wheel and having eX- tensions formed thereon on opposite sides of the wheel, and guides formed on each these extensions adapted to engage corresponding guide ways on the machine tool frame whereby said head will be rigidly supported on said frame while permitted to slide 'ireely.

3. [r machine tool comprising in combination, a base, a work support thereon, a column, a wheel hard slidably mounted thereon, a rotatable cutting wheel mounted in said head, projections extending laterally therefrom and provided with guides adapted to engage corresponding guideways formed on the column, and a depending projection formed integrally on said head and surrounding a portion of said wheel, said depending projection having lateral portions forming guides adapted to engage supplemental guideways also formed on the column.

t. A surface grinding machine comprisof this wheel head 21. With ing in combination, a base, a column thereon, a Wheel head slidably mounted on said column and having a rotatable Wheel therein, said head having integrally formed guides spaced from each other respectively above and below the Wheel, and guiding Ways corresponding therewith formed on.

said column whereby the Wheel head Will column.

In testimony W signature.

hereof, I hereto aflix my JOHN A. DOANE. 

